The world "verlan" itself is verlan for "envers" ("in reverse")
“Verlan” itself comes from the reverse of “l’envers” which means “reverse”.
Je suis allé à une teuf de ouf => je suis allé à une fête de fou
Literally :
I went to an zeecray teepar => I went to a crazy party
C'est pas oim => c'est pas moi (It's not me)
Fais pas ièch => fais pas chier (stop bothering /(f*cking with) me)
Je l'ai ken => je l'ai niqué(e) (I screwed him/her)
Found that with a quick Google search: https://www.francaisavecpierre.com/le-verlan/
L'envers becomes verlan, femme becomes meuf, fête teuf, louche is chelou and merci is cimer, for the most common, everyday words.
It can even go further, with Arabe becoming Beur which itself gets verlanised into Rebeu. Or meuf, femeu.